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migration/postcopy: Ensure postcopy_start() sets errp if it fails

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There are several places where postcopy_start() fails without setting
errp. This can cause a null pointer de-reference, as in case of error,
the caller of postcopy_start() copies/prints the error set in errp.

Fix it by setting errp in all of postcopy_start() error paths.

Cc: qemu-stable <qemu-stable@nongnu.org>
Fixes: 908927db28 ("migration: Update error description whenever migration fails")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240328140252.16756-3-avihaih@nvidia.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Avihai Horon 2024-03-28 16:02:52 +02:00 committed by Peter Xu
parent 30158d8850
commit d0ad271a76
1 changed files with 8 additions and 0 deletions
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8
migration/migration.c
View file

@ -2510,6 +2510,8 @@ static int postcopy_start(MigrationState *ms, Error **errp)
migration_wait_main_channel(ms);
if (postcopy_preempt_establish_channel(ms)) {
migrate_set_state(&ms->state, ms->state, MIGRATION_STATUS_FAILED);
error_setg(errp, "%s: Failed to establish preempt channel",
__func__);
return -1;
}
}
@ -2525,17 +2527,22 @@ static int postcopy_start(MigrationState *ms, Error **errp)
ret = migration_stop_vm(ms, RUN_STATE_FINISH_MIGRATE);
if (ret < 0) {
error_setg_errno(errp, -ret, "%s: Failed to stop the VM", __func__);
goto fail;
}
ret = migration_maybe_pause(ms, &cur_state,
MIGRATION_STATUS_POSTCOPY_ACTIVE);
if (ret < 0) {
error_setg_errno(errp, -ret, "%s: Failed in migration_maybe_pause()",
__func__);
goto fail;
}
ret = bdrv_inactivate_all();
if (ret < 0) {
error_setg_errno(errp, -ret, "%s: Failed in bdrv_inactivate_all()",
__func__);
goto fail;
}
restart_block = true;
@ -2612,6 +2619,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
/* Now send that blob */
if (qemu_savevm_send_packaged(ms->to_dst_file, bioc->data, bioc->usage)) {
error_setg(errp, "%s: Failed to send packaged data", __func__);
goto fail_closefb;
}
qemu_fclose(fb);